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-H. E. McKEE.

PISTON CONSTRUCTION.

- APPLICATION FILED SEPT. 12. 1918.

Patented July 29, 1919.

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. HOMER E. WICKEE, OF BRADDYVILLE, IOWA.

PISTON CONSTRUCTION.

Specification of Letters Patent.

Patented July 29, 1919.

Application filed September 12, 1918. Serial No. 253,771.

To all whom it may concern Be it known that I, HOMER E. MCKEE, a citizen of the United States, residing at Braddyville, in the county of Page and State, of Iowa, have invented certain new and useful Improvements in Piston Constructions, of which the following is a specification.

This invention relates to a piston and has for its principal object the production of a structure which will facilitate the removal of the piston from the pitman after the cylinder head has been removed, thus permitting access to the interior of the cylinder without necessitating the removal of the crank case prior to such operation.

Another object of this invention is the production of a piston wherein a block is employed for connecting the pitman to the piston, thus permitting the releasing of the block to allow the piston to be removed.

Another object of this invention is the production of a piston having grooves formed therein for receiving the ends of the wrist pin connecting the pitman and the block, thus causing the pin to be firmly held in an operative position.

Another object of this invention is the production of a piston wherein a pair of oppositely extending webs are formed in alinement with the grooves provided in the piston, thus causing the webs to bear firmly upon the wrist pin for reinforcing the pin when the device is in use.

One practical form of construction and assembly of the present invention will be hereinafter described and is illustrated in the drawing, in which Figure 1 is a vertical section through the piston illustrating the sections, portions of the device being shown in elevation.

Fig. 2 is a bottom plan view of the piston and its connections, the pitman being shown in transverse section, and

Fig. 3 is a top plan view of the device.

In the preferred embodiment of the present invention about to be described, it will be seen that 5 indicates the piston which may be of any desired construction and is pror ided with grooves 6 adapted to receive the usual piston rings. An opening 7 is formed in the top of the piston 5 extending centrally therethrough as shown by Figs. 1 and 3. The Webs 8 are formed integral with the inner surfaces of the piston 5, as shown in Fig. 1. The webs are substantially sector shaped and extend from opposite sides of the piston inwardly toward the center of the piston and toward each other. These webs 8 have flat lower edges 9, although the outer edge 10 of each is curved to merge in the surface of the piston 5. Grooves 11 are formed in the inner surface of the piston 5 and these grooves 11 extend toward the webs 8, for purposes to be hereinafter set forth. It will be noted that the inner ends of these grooves 11 terminate in alinement with the flat edges or surfaces 9 of the webs 8 and that the grooves extend from the lower end of the piston 5.

A pit-man 12 is provided and the bearing sleeve 13 is formed upon one end of the pitman 12, as is the usual construction,thus permitting the sleeve to be connected to the crank shaft, or to any other desired element not being deemed necessary tobe hereinillustrated. The pitman 12 is also provided with a head having reduced bearing sleeves 15 formed thereon in alinement with each other for purposes to be hereinafter set forth.

The block 16 is also provided with spaced bearing sleeves 17 at its broadest portion it being noted that the block 16 is substantially the same width at its lower portion as the space between the webs 8. This block 16 tapers toward its upper end and has a threaded neck 18 extending therefrom and projecting through the opening 7 formed in the piston 5. The not 19 is movably carried upon the neck 18 for holding the same in engagement with the piston.

A wrist pin 20 is passed through the bearing sleeves 15 of the pitman l2 and the bean ing sleeves 17 of the block 16, thus pivotally connecting the block with the itman. The bearin sleeves of the block t upon each side 0 the bearing sleeves 15 of the pitman and thus facilitate the support ofvthe pitman as above mentioned.

When the device is assembled, the pin is first passed through the bearing sleeves of the pitman and block as above specified. The piston is then passed over the block and one end of the pitman and at this time. the

ends of the wrist pin 20 are passed into the grooves 11. If necessary, a suitable lmplement may be passed through the opening 7 formed in the piston 5 for directing the neck 18 through the opening 7. After the neck has been passed through the opening justreferred to, the nut 19 is screwed into engagement with the neck and also bears upon the piston, thus firmly binding the block in engagement with the top of the piston 5. If

desired, any suitable locking means may be employed for holding the nut against accidental shifting, without departing from the s irit of the present invention. After the b ock has been secured as above specified, it will be noted that the pin 20 is firmly held against displacement for the ends of the pin will fit within the grooves 11, thus holding the piston against any tendency of rotary movement around the pitman, while the flat lower surfaces or edges 9 of the Webs bear upon the pin where it projects from the sleeves of the block 16 to where it fits within the grooves, thus firmly reinforcing the pm.

It is therefore obvious that vas the device is used, the propulsion power brought to bear upon the piston will be imparted to the block 16 and also the webs 8 will bear firmly upon the pin and thus cause the movement 0 the piston to be imparted through the websand pin to the pitman as Well as by the block 16 as above stated. Upon the return stroke, the connection of the neck 18 is sufficient to draw the pitman to the position where the next power stroke of the piston 5 will drive the pitman, through the block 16 and the pin 2 With the pistons ordinarily now in use, it is known that in order to have access to the piston, where it is desired to place piston i rings thereon or easily clean the entire cylinder, it is first necessary to remove the lower portions of the crank case and then remove the crank as well as the pitman to allow the pistons to be removed from the cylinders.

With the present device however, the head of the cylinder is removed and then when access is desired to a particular piston, the nut 19 thereof is removed and the piston then is lifted from the cylinder. This is allowed, by the removal of the piston from engagement with the neck 18 and at the same time the pin 20 will pass through the grooves 11 from engagement with the piston. After any desired operation upon the piston or within the cylinder is had, the piston is then slipped back into the cylinder and the pin directed into the grooves until it finally bears 'upon the lower surfaces or edges 9 of the webs 8. The neck 18 is passed through the opening 7 and then the nut 19 is again se- W cured to the neck 18, thus holding the device in an assembled and operative condition. It is obvious that the pitman 12 may freely swing upon the pin 20, although the block 16 is so connected and the pin 20 so reinforced as to cause positive reciprocal movement of the pitman 12 as the piston 5 is reciprocated.

The foregoing description and the drawings have reference to what may be considered the preferred, or approved form of my invention. It isto be understood that I may make such changes in construction and arrangement and combinationof parts, materials, dimensions, et cetera, as may prove expedient and fall within the scope of' the appended claims. K

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

' 1. In a device of the class described, the

combination of a piston, a pitman, a block releasably' connected to said piston, said piston having internal grooves therein, webs carried by said piston, and a pin pivotally connecting said pitman to said block, said pin extending into said grooves and bearing upon the webs whereby said pin is reinforced.

2. In a device'of the class described, the combination of a piston having internal grooves therein, webs carried within said piston and having flat edges extending at right anglesto the grooves, said piston having an opening formed therethrough, a pitman-having bearing sleeves thereon, a block having bearing sleeves engaging the bearin sleeves of the pitman, a pin passing throug said bearing sleeves for pivotally connecting said block to said pitman, said pin having its ends projecting into said grooves and bearing upon the flat edges of said webs,

thus causing the pin to be reinforced, a neck.

extending from said block and projecting through the opening in said piston, and means enga 'ng said neck for releasably holding the lock in engagement with the piston.

In testimony whereof I afiix my signature in presence of two Witnesses.

HOMER E. MeKEE, I

Witnesses:

CALVIN BURCH, JNO. F. WOLFE. 

